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Increase the compatibility with TV

Home Forums OSSC OSSC – Discussion and support Increase the compatibility with TV

This topic contains 3 replies, has 4 voices, and was last updated by  paulb_nl 5 months, 3 weeks ago.

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  • #18023

    ludovictor
    Participant

    Hi everyone ! I have a technical question for marqs.

    If I perfectly understand how works the OSSC, it multiply each line by 2 3 4 or 5 and it increases the size of the screen. For example if I have a resolution of 240p, I can have 480, 720, 960 etc …

    The problem of the compatibility is TVs don’t understand the strange resolution like 720×960. Is it not possible to add “black pixel” to get a good resolution. Because the OSSC multiply the number of line, it could count the number of pixel too. So is it possible to add black pixel on the right and the left of the screen to get a good resolution and so to be compatible with TVs.

    What do you think about that ? I don’t think it is difficult to add this possibility. And if it adds very few lags, I think it could be good to have the choice between compatibility and lag.

    #18074

    BuckoA51
    Keymaster

    Such functionality is not possible without a frame buffer.

    #18250

    SRRAE
    Participant

    Would it need a buffer?
    I don’t understand fully how the OSSC works but what I do understand is the OSSC gets the line from the analogue signal and then pumps it out digitally either doubling, tripling etc the output line.

    Is it possible, to say, when it reaches line 960, it then outputs 120 blank lines? It won’t use the full screen size of 1080 and will ultimately cause it to be in a box in the middle of the screen, but it will make the resolution more standard and accepted by more TVs.

    I have seen an option which asks which resolution you want one of the multipliers to output.

    #18252

    paulb_nl
    Participant

    The OSSC already outputs standard resolutions: 640/720×480, 1280×720, 1920×1080 so thats not the problem. The output timings is the problem and the OSSC needs more line buffer memory and clock hardware to output correct timings.

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